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    <h1>
        <i class="fa fa-circle-o-notch fa-spin"></i>
        <a href="../.." >对象</a>
    </h1>
</div>




                    <div class="page-wrapper" tabindex="-1" role="main">
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                                <section class="normal markdown-section">
                                
                                <h1 id="&#x5BF9;&#x8C61;">&#x5BF9;&#x8C61;</h1>
<h2 id="&#x6982;&#x8FF0;">&#x6982;&#x8FF0;</h2>
<h3 id="&#x751F;&#x6210;&#x65B9;&#x6CD5;">&#x751F;&#x6210;&#x65B9;&#x6CD5;</h3>
<p>&#x5BF9;&#x8C61;&#xFF08;object&#xFF09;&#x662F; JavaScript &#x8BED;&#x8A00;&#x7684;&#x6838;&#x5FC3;&#x6982;&#x5FF5;&#xFF0C;&#x4E5F;&#x662F;&#x6700;&#x91CD;&#x8981;&#x7684;&#x6570;&#x636E;&#x7C7B;&#x578B;&#x3002;</p>
<p>&#x4EC0;&#x4E48;&#x662F;&#x5BF9;&#x8C61;&#xFF1F;&#x7B80;&#x5355;&#x8BF4;&#xFF0C;&#x5BF9;&#x8C61;&#x5C31;&#x662F;&#x4E00;&#x7EC4;&#x201C;&#x952E;&#x503C;&#x5BF9;&#x201D;&#xFF08;key-value&#xFF09;&#x7684;&#x96C6;&#x5408;&#xFF0C;&#x662F;&#x4E00;&#x79CD;&#x65E0;&#x5E8F;&#x7684;&#x590D;&#x5408;&#x6570;&#x636E;&#x96C6;&#x5408;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  foo: <span class="hljs-string">&apos;Hello&apos;</span>,
  bar: <span class="hljs-string">&apos;World&apos;</span>
};
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5927;&#x62EC;&#x53F7;&#x5C31;&#x5B9A;&#x4E49;&#x4E86;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x5B83;&#x88AB;&#x8D4B;&#x503C;&#x7ED9;&#x53D8;&#x91CF;<code>obj</code>&#xFF0C;&#x6240;&#x4EE5;&#x53D8;&#x91CF;<code>obj</code>&#x5C31;&#x6307;&#x5411;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x3002;&#x8BE5;&#x5BF9;&#x8C61;&#x5185;&#x90E8;&#x5305;&#x542B;&#x4E24;&#x4E2A;&#x952E;&#x503C;&#x5BF9;&#xFF08;&#x53C8;&#x79F0;&#x4E3A;&#x4E24;&#x4E2A;&#x201C;&#x6210;&#x5458;&#x201D;&#xFF09;&#xFF0C;&#x7B2C;&#x4E00;&#x4E2A;&#x952E;&#x503C;&#x5BF9;&#x662F;<code>foo: &apos;Hello&apos;</code>&#xFF0C;&#x5176;&#x4E2D;<code>foo</code>&#x662F;&#x201C;&#x952E;&#x540D;&#x201D;&#xFF08;&#x6210;&#x5458;&#x7684;&#x540D;&#x79F0;&#xFF09;&#xFF0C;&#x5B57;&#x7B26;&#x4E32;<code>Hello</code>&#x662F;&#x201C;&#x952E;&#x503C;&#x201D;&#xFF08;&#x6210;&#x5458;&#x7684;&#x503C;&#xFF09;&#x3002;&#x952E;&#x540D;&#x4E0E;&#x952E;&#x503C;&#x4E4B;&#x95F4;&#x7528;&#x5192;&#x53F7;&#x5206;&#x9694;&#x3002;&#x7B2C;&#x4E8C;&#x4E2A;&#x952E;&#x503C;&#x5BF9;&#x662F;<code>bar: &apos;World&apos;</code>&#xFF0C;<code>bar</code>&#x662F;&#x952E;&#x540D;&#xFF0C;<code>World</code>&#x662F;&#x952E;&#x503C;&#x3002;&#x4E24;&#x4E2A;&#x952E;&#x503C;&#x5BF9;&#x4E4B;&#x95F4;&#x7528;&#x9017;&#x53F7;&#x5206;&#x9694;&#x3002;</p>
<h3 id="&#x952E;&#x540D;">&#x952E;&#x540D;</h3>
<p>&#x5BF9;&#x8C61;&#x7684;&#x6240;&#x6709;&#x952E;&#x540D;&#x90FD;&#x662F;&#x5B57;&#x7B26;&#x4E32;&#xFF08;ES6 &#x53C8;&#x5F15;&#x5165;&#x4E86; Symbol &#x503C;&#x4E5F;&#x53EF;&#x4EE5;&#x4F5C;&#x4E3A;&#x952E;&#x540D;&#xFF09;&#xFF0C;&#x6240;&#x4EE5;&#x52A0;&#x4E0D;&#x52A0;&#x5F15;&#x53F7;&#x90FD;&#x53EF;&#x4EE5;&#x3002;&#x4E0A;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x4E5F;&#x53EF;&#x4EE5;&#x5199;&#x6210;&#x4E0B;&#x9762;&#x8FD9;&#x6837;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  <span class="hljs-string">&apos;foo&apos;</span>: <span class="hljs-string">&apos;Hello&apos;</span>,
  <span class="hljs-string">&apos;bar&apos;</span>: <span class="hljs-string">&apos;World&apos;</span>
};
</code></pre>
<p>&#x5982;&#x679C;&#x952E;&#x540D;&#x662F;&#x6570;&#x503C;&#xFF0C;&#x4F1A;&#x88AB;&#x81EA;&#x52A8;&#x8F6C;&#x4E3A;&#x5B57;&#x7B26;&#x4E32;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  <span class="hljs-number">1</span>: <span class="hljs-string">&apos;a&apos;</span>,
  <span class="hljs-number">3.2</span>: <span class="hljs-string">&apos;b&apos;</span>,
  <span class="hljs-number">1e2</span>: <span class="hljs-literal">true</span>,
  <span class="hljs-number">1e-2</span>: <span class="hljs-literal">true</span>,
  <span class="hljs-number">.234</span>: <span class="hljs-literal">true</span>,
  <span class="hljs-number">0xFF</span>: <span class="hljs-literal">true</span>
};

obj
<span class="hljs-comment">// Object {</span>
<span class="hljs-comment">//   1: &quot;a&quot;,</span>
<span class="hljs-comment">//   3.2: &quot;b&quot;,</span>
<span class="hljs-comment">//   100: true,</span>
<span class="hljs-comment">//   0.01: true,</span>
<span class="hljs-comment">//   0.234: true,</span>
<span class="hljs-comment">//   255: true</span>
<span class="hljs-comment">// }</span>

obj[<span class="hljs-string">&apos;100&apos;</span>] <span class="hljs-comment">// true</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;<code>obj</code>&#x7684;&#x6240;&#x6709;&#x952E;&#x540D;&#x867D;&#x7136;&#x770B;&#x4E0A;&#x53BB;&#x50CF;&#x6570;&#x503C;&#xFF0C;&#x5B9E;&#x9645;&#x4E0A;&#x90FD;&#x88AB;&#x81EA;&#x52A8;&#x8F6C;&#x6210;&#x4E86;&#x5B57;&#x7B26;&#x4E32;&#x3002;</p>
<p>&#x5982;&#x679C;&#x952E;&#x540D;&#x4E0D;&#x7B26;&#x5408;&#x6807;&#x8BC6;&#x540D;&#x7684;&#x6761;&#x4EF6;&#xFF08;&#x6BD4;&#x5982;&#x7B2C;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E3A;&#x6570;&#x5B57;&#xFF0C;&#x6216;&#x8005;&#x542B;&#x6709;&#x7A7A;&#x683C;&#x6216;&#x8FD0;&#x7B97;&#x7B26;&#xFF09;&#xFF0C;&#x4E14;&#x4E5F;&#x4E0D;&#x662F;&#x6570;&#x5B57;&#xFF0C;&#x5219;&#x5FC5;&#x987B;&#x52A0;&#x4E0A;&#x5F15;&#x53F7;&#xFF0C;&#x5426;&#x5219;&#x4F1A;&#x62A5;&#x9519;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x62A5;&#x9519;</span>
<span class="hljs-keyword">var</span> obj = {
  <span class="hljs-number">1</span>p: <span class="hljs-string">&apos;Hello World&apos;</span>
};

<span class="hljs-comment">// &#x4E0D;&#x62A5;&#x9519;</span>
<span class="hljs-keyword">var</span> obj = {
  <span class="hljs-string">&apos;1p&apos;</span>: <span class="hljs-string">&apos;Hello World&apos;</span>,
  <span class="hljs-string">&apos;h w&apos;</span>: <span class="hljs-string">&apos;Hello World&apos;</span>,
  <span class="hljs-string">&apos;p+q&apos;</span>: <span class="hljs-string">&apos;Hello World&apos;</span>
};
</code></pre>
<p>&#x4E0A;&#x9762;&#x5BF9;&#x8C61;&#x7684;&#x4E09;&#x4E2A;&#x952E;&#x540D;&#xFF0C;&#x90FD;&#x4E0D;&#x7B26;&#x5408;&#x6807;&#x8BC6;&#x540D;&#x7684;&#x6761;&#x4EF6;&#xFF0C;&#x6240;&#x4EE5;&#x5FC5;&#x987B;&#x52A0;&#x4E0A;&#x5F15;&#x53F7;&#x3002;</p>
<p>&#x5BF9;&#x8C61;&#x7684;&#x6BCF;&#x4E00;&#x4E2A;&#x952E;&#x540D;&#x53C8;&#x79F0;&#x4E3A;&#x201C;&#x5C5E;&#x6027;&#x201D;&#xFF08;property&#xFF09;&#xFF0C;&#x5B83;&#x7684;&#x201C;&#x952E;&#x503C;&#x201D;&#x53EF;&#x4EE5;&#x662F;&#x4EFB;&#x4F55;&#x6570;&#x636E;&#x7C7B;&#x578B;&#x3002;&#x5982;&#x679C;&#x4E00;&#x4E2A;&#x5C5E;&#x6027;&#x7684;&#x503C;&#x4E3A;&#x51FD;&#x6570;&#xFF0C;&#x901A;&#x5E38;&#x628A;&#x8FD9;&#x4E2A;&#x5C5E;&#x6027;&#x79F0;&#x4E3A;&#x201C;&#x65B9;&#x6CD5;&#x201D;&#xFF0C;&#x5B83;&#x53EF;&#x4EE5;&#x50CF;&#x51FD;&#x6570;&#x90A3;&#x6837;&#x8C03;&#x7528;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  p: <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">x</span>) </span>{
    <span class="hljs-keyword">return</span> <span class="hljs-number">2</span> * x;
  }
};

obj.p(<span class="hljs-number">1</span>) <span class="hljs-comment">// 2</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;<code>obj</code>&#x7684;&#x5C5E;&#x6027;<code>p</code>&#xFF0C;&#x5C31;&#x6307;&#x5411;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x3002;</p>
<p>&#x5982;&#x679C;&#x5C5E;&#x6027;&#x7684;&#x503C;&#x8FD8;&#x662F;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x5C31;&#x5F62;&#x6210;&#x4E86;&#x94FE;&#x5F0F;&#x5F15;&#x7528;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> o1 = {};
<span class="hljs-keyword">var</span> o2 = { bar: <span class="hljs-string">&apos;hello&apos;</span> };

o1.foo = o2;
o1.foo.bar <span class="hljs-comment">// &quot;hello&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;<code>o1</code>&#x7684;&#x5C5E;&#x6027;<code>foo</code>&#x6307;&#x5411;&#x5BF9;&#x8C61;<code>o2</code>&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x94FE;&#x5F0F;&#x5F15;&#x7528;<code>o2</code>&#x7684;&#x5C5E;&#x6027;&#x3002;</p>
<p>&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#x4E4B;&#x95F4;&#x7528;&#x9017;&#x53F7;&#x5206;&#x9694;&#xFF0C;&#x6700;&#x540E;&#x4E00;&#x4E2A;&#x5C5E;&#x6027;&#x540E;&#x9762;&#x53EF;&#x4EE5;&#x52A0;&#x9017;&#x53F7;&#xFF08;trailing comma&#xFF09;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x4E0D;&#x52A0;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  p: <span class="hljs-number">123</span>,
  m: <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{ ... },
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>m</code>&#x5C5E;&#x6027;&#x540E;&#x9762;&#x7684;&#x90A3;&#x4E2A;&#x9017;&#x53F7;&#xFF0C;&#x6709;&#x6CA1;&#x6709;&#x90FD;&#x53EF;&#x4EE5;&#x3002;</p>
<p>&#x5C5E;&#x6027;&#x53EF;&#x4EE5;&#x52A8;&#x6001;&#x521B;&#x5EFA;&#xFF0C;&#x4E0D;&#x5FC5;&#x5728;&#x5BF9;&#x8C61;&#x58F0;&#x660E;&#x65F6;&#x5C31;&#x6307;&#x5B9A;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {};
obj.foo = <span class="hljs-number">123</span>;
obj.foo <span class="hljs-comment">// 123</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x76F4;&#x63A5;&#x5BF9;<code>obj</code>&#x5BF9;&#x8C61;&#x7684;<code>foo</code>&#x5C5E;&#x6027;&#x8D4B;&#x503C;&#xFF0C;&#x7ED3;&#x679C;&#x5C31;&#x5728;&#x8FD0;&#x884C;&#x65F6;&#x521B;&#x5EFA;&#x4E86;<code>foo</code>&#x5C5E;&#x6027;&#x3002;</p>
<h3 id="&#x5BF9;&#x8C61;&#x7684;&#x5F15;&#x7528;">&#x5BF9;&#x8C61;&#x7684;&#x5F15;&#x7528;</h3>
<p>&#x5982;&#x679C;&#x4E0D;&#x540C;&#x7684;&#x53D8;&#x91CF;&#x540D;&#x6307;&#x5411;&#x540C;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x90A3;&#x4E48;&#x5B83;&#x4EEC;&#x90FD;&#x662F;&#x8FD9;&#x4E2A;&#x5BF9;&#x8C61;&#x7684;&#x5F15;&#x7528;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#x6307;&#x5411;&#x540C;&#x4E00;&#x4E2A;&#x5185;&#x5B58;&#x5730;&#x5740;&#x3002;&#x4FEE;&#x6539;&#x5176;&#x4E2D;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;&#xFF0C;&#x4F1A;&#x5F71;&#x54CD;&#x5230;&#x5176;&#x4ED6;&#x6240;&#x6709;&#x53D8;&#x91CF;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> o1 = {};
<span class="hljs-keyword">var</span> o2 = o1;

o1.a = <span class="hljs-number">1</span>;
o2.a <span class="hljs-comment">// 1</span>

o2.b = <span class="hljs-number">2</span>;
o1.b <span class="hljs-comment">// 2</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>o1</code>&#x548C;<code>o2</code>&#x6307;&#x5411;&#x540C;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x56E0;&#x6B64;&#x4E3A;&#x5176;&#x4E2D;&#x4EFB;&#x4F55;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;&#x6DFB;&#x52A0;&#x5C5E;&#x6027;&#xFF0C;&#x53E6;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;&#x90FD;&#x53EF;&#x4EE5;&#x8BFB;&#x5199;&#x8BE5;&#x5C5E;&#x6027;&#x3002;</p>
<p>&#x6B64;&#x65F6;&#xFF0C;&#x5982;&#x679C;&#x53D6;&#x6D88;&#x67D0;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;&#x5BF9;&#x4E8E;&#x539F;&#x5BF9;&#x8C61;&#x7684;&#x5F15;&#x7528;&#xFF0C;&#x4E0D;&#x4F1A;&#x5F71;&#x54CD;&#x5230;&#x53E6;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> o1 = {};
<span class="hljs-keyword">var</span> o2 = o1;

o1 = <span class="hljs-number">1</span>;
o2 <span class="hljs-comment">// {}</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>o1</code>&#x548C;<code>o2</code>&#x6307;&#x5411;&#x540C;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#xFF0C;&#x7136;&#x540E;<code>o1</code>&#x7684;&#x503C;&#x53D8;&#x4E3A;1&#xFF0C;&#x8FD9;&#x65F6;&#x4E0D;&#x4F1A;&#x5BF9;<code>o2</code>&#x4EA7;&#x751F;&#x5F71;&#x54CD;&#xFF0C;<code>o2</code>&#x8FD8;&#x662F;&#x6307;&#x5411;&#x539F;&#x6765;&#x7684;&#x90A3;&#x4E2A;&#x5BF9;&#x8C61;&#x3002;</p>
<p>&#x4F46;&#x662F;&#xFF0C;&#x8FD9;&#x79CD;&#x5F15;&#x7528;&#x53EA;&#x5C40;&#x9650;&#x4E8E;&#x5BF9;&#x8C61;&#xFF0C;&#x5982;&#x679C;&#x4E24;&#x4E2A;&#x53D8;&#x91CF;&#x6307;&#x5411;&#x540C;&#x4E00;&#x4E2A;&#x539F;&#x59CB;&#x7C7B;&#x578B;&#x7684;&#x503C;&#x3002;&#x90A3;&#x4E48;&#xFF0C;&#x53D8;&#x91CF;&#x8FD9;&#x65F6;&#x90FD;&#x662F;&#x503C;&#x7684;&#x62F7;&#x8D1D;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> x = <span class="hljs-number">1</span>;
<span class="hljs-keyword">var</span> y = x;

x = <span class="hljs-number">2</span>;
y <span class="hljs-comment">// 1</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5F53;<code>x</code>&#x7684;&#x503C;&#x53D1;&#x751F;&#x53D8;&#x5316;&#x540E;&#xFF0C;<code>y</code>&#x7684;&#x503C;&#x5E76;&#x4E0D;&#x53D8;&#xFF0C;&#x8FD9;&#x5C31;&#x8868;&#x793A;<code>y</code>&#x548C;<code>x</code>&#x5E76;&#x4E0D;&#x662F;&#x6307;&#x5411;&#x540C;&#x4E00;&#x4E2A;&#x5185;&#x5B58;&#x5730;&#x5740;&#x3002;</p>
<h3 id="&#x8868;&#x8FBE;&#x5F0F;&#x8FD8;&#x662F;&#x8BED;&#x53E5;&#xFF1F;">&#x8868;&#x8FBE;&#x5F0F;&#x8FD8;&#x662F;&#x8BED;&#x53E5;&#xFF1F;</h3>
<p>&#x5BF9;&#x8C61;&#x91C7;&#x7528;&#x5927;&#x62EC;&#x53F7;&#x8868;&#x793A;&#xFF0C;&#x8FD9;&#x5BFC;&#x81F4;&#x4E86;&#x4E00;&#x4E2A;&#x95EE;&#x9898;&#xFF1A;&#x5982;&#x679C;&#x884C;&#x9996;&#x662F;&#x4E00;&#x4E2A;&#x5927;&#x62EC;&#x53F7;&#xFF0C;&#x5B83;&#x5230;&#x5E95;&#x662F;&#x8868;&#x8FBE;&#x5F0F;&#x8FD8;&#x662F;&#x8BED;&#x53E5;&#xFF1F;</p>
<pre><code class="lang-javascript">{ foo: <span class="hljs-number">123</span> }
</code></pre>
<p>JavaScript &#x5F15;&#x64CE;&#x8BFB;&#x5230;&#x4E0A;&#x9762;&#x8FD9;&#x884C;&#x4EE3;&#x7801;&#xFF0C;&#x4F1A;&#x53D1;&#x73B0;&#x53EF;&#x80FD;&#x6709;&#x4E24;&#x79CD;&#x542B;&#x4E49;&#x3002;&#x7B2C;&#x4E00;&#x79CD;&#x53EF;&#x80FD;&#x662F;&#xFF0C;&#x8FD9;&#x662F;&#x4E00;&#x4E2A;&#x8868;&#x8FBE;&#x5F0F;&#xFF0C;&#x8868;&#x793A;&#x4E00;&#x4E2A;&#x5305;&#x542B;<code>foo</code>&#x5C5E;&#x6027;&#x7684;&#x5BF9;&#x8C61;&#xFF1B;&#x7B2C;&#x4E8C;&#x79CD;&#x53EF;&#x80FD;&#x662F;&#xFF0C;&#x8FD9;&#x662F;&#x4E00;&#x4E2A;&#x8BED;&#x53E5;&#xFF0C;&#x8868;&#x793A;&#x4E00;&#x4E2A;&#x4EE3;&#x7801;&#x533A;&#x5757;&#xFF0C;&#x91CC;&#x9762;&#x6709;&#x4E00;&#x4E2A;&#x6807;&#x7B7E;<code>foo</code>&#xFF0C;&#x6307;&#x5411;&#x8868;&#x8FBE;&#x5F0F;<code>123</code>&#x3002;</p>
<p>&#x4E3A;&#x4E86;&#x907F;&#x514D;&#x8FD9;&#x79CD;&#x6B67;&#x4E49;&#xFF0C;JavaScript &#x5F15;&#x64CE;&#x7684;&#x505A;&#x6CD5;&#x662F;&#xFF0C;&#x5982;&#x679C;&#x9047;&#x5230;&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#xFF0C;&#x65E0;&#x6CD5;&#x786E;&#x5B9A;&#x662F;&#x5BF9;&#x8C61;&#x8FD8;&#x662F;&#x4EE3;&#x7801;&#x5757;&#xFF0C;&#x4E00;&#x5F8B;&#x89E3;&#x91CA;&#x4E3A;&#x4EE3;&#x7801;&#x5757;&#x3002;</p>
<pre><code class="lang-javascript">{ <span class="hljs-built_in">console</span>.log(<span class="hljs-number">123</span>) } <span class="hljs-comment">// 123</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x7684;&#x8BED;&#x53E5;&#x662F;&#x4E00;&#x4E2A;&#x4EE3;&#x7801;&#x5757;&#xFF0C;&#x800C;&#x4E14;&#x53EA;&#x6709;&#x89E3;&#x91CA;&#x4E3A;&#x4EE3;&#x7801;&#x5757;&#xFF0C;&#x624D;&#x80FD;&#x6267;&#x884C;&#x3002;</p>
<p>&#x5982;&#x679C;&#x8981;&#x89E3;&#x91CA;&#x4E3A;&#x5BF9;&#x8C61;&#xFF0C;&#x6700;&#x597D;&#x5728;&#x5927;&#x62EC;&#x53F7;&#x524D;&#x52A0;&#x4E0A;&#x5706;&#x62EC;&#x53F7;&#x3002;&#x56E0;&#x4E3A;&#x5706;&#x62EC;&#x53F7;&#x7684;&#x91CC;&#x9762;&#xFF0C;&#x53EA;&#x80FD;&#x662F;&#x8868;&#x8FBE;&#x5F0F;&#xFF0C;&#x6240;&#x4EE5;&#x786E;&#x4FDD;&#x5927;&#x62EC;&#x53F7;&#x53EA;&#x80FD;&#x89E3;&#x91CA;&#x4E3A;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript">({ foo: <span class="hljs-number">123</span> }) <span class="hljs-comment">// &#x6B63;&#x786E;</span>
({ <span class="hljs-built_in">console</span>.log(<span class="hljs-number">123</span>) }) <span class="hljs-comment">// &#x62A5;&#x9519;</span>
</code></pre>
<p>&#x8FD9;&#x79CD;&#x5DEE;&#x5F02;&#x5728;<code>eval</code>&#x8BED;&#x53E5;&#xFF08;&#x4F5C;&#x7528;&#x662F;&#x5BF9;&#x5B57;&#x7B26;&#x4E32;&#x6C42;&#x503C;&#xFF09;&#x4E2D;&#x53CD;&#x6620;&#x5F97;&#x6700;&#x660E;&#x663E;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-built_in">eval</span>(<span class="hljs-string">&apos;{foo: 123}&apos;</span>) <span class="hljs-comment">// 123</span>
<span class="hljs-built_in">eval</span>(<span class="hljs-string">&apos;({foo: 123})&apos;</span>) <span class="hljs-comment">// {foo: 123}</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5982;&#x679C;&#x6CA1;&#x6709;&#x5706;&#x62EC;&#x53F7;&#xFF0C;<code>eval</code>&#x5C06;&#x5176;&#x7406;&#x89E3;&#x4E3A;&#x4E00;&#x4E2A;&#x4EE3;&#x7801;&#x5757;&#xFF1B;&#x52A0;&#x4E0A;&#x5706;&#x62EC;&#x53F7;&#x4EE5;&#x540E;&#xFF0C;&#x5C31;&#x7406;&#x89E3;&#x6210;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x3002;</p>
<h2 id="&#x5C5E;&#x6027;&#x7684;&#x64CD;&#x4F5C;">&#x5C5E;&#x6027;&#x7684;&#x64CD;&#x4F5C;</h2>
<h3 id="&#x5C5E;&#x6027;&#x7684;&#x8BFB;&#x53D6;">&#x5C5E;&#x6027;&#x7684;&#x8BFB;&#x53D6;</h3>
<p>&#x8BFB;&#x53D6;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x6709;&#x4E24;&#x79CD;&#x65B9;&#x6CD5;&#xFF0C;&#x4E00;&#x79CD;&#x662F;&#x4F7F;&#x7528;&#x70B9;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x8FD8;&#x6709;&#x4E00;&#x79CD;&#x662F;&#x4F7F;&#x7528;&#x65B9;&#x62EC;&#x53F7;&#x8FD0;&#x7B97;&#x7B26;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  p: <span class="hljs-string">&apos;Hello World&apos;</span>
};

obj.p <span class="hljs-comment">// &quot;Hello World&quot;</span>
obj[<span class="hljs-string">&apos;p&apos;</span>] <span class="hljs-comment">// &quot;Hello World&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x5206;&#x522B;&#x91C7;&#x7528;&#x70B9;&#x8FD0;&#x7B97;&#x7B26;&#x548C;&#x65B9;&#x62EC;&#x53F7;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x8BFB;&#x53D6;&#x5C5E;&#x6027;<code>p</code>&#x3002;</p>
<p>&#x8BF7;&#x6CE8;&#x610F;&#xFF0C;&#x5982;&#x679C;&#x4F7F;&#x7528;&#x65B9;&#x62EC;&#x53F7;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x952E;&#x540D;&#x5FC5;&#x987B;&#x653E;&#x5728;&#x5F15;&#x53F7;&#x91CC;&#x9762;&#xFF0C;&#x5426;&#x5219;&#x4F1A;&#x88AB;&#x5F53;&#x4F5C;&#x53D8;&#x91CF;&#x5904;&#x7406;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> foo = <span class="hljs-string">&apos;bar&apos;</span>;

<span class="hljs-keyword">var</span> obj = {
  foo: <span class="hljs-number">1</span>,
  bar: <span class="hljs-number">2</span>
};

obj.foo  <span class="hljs-comment">// 1</span>
obj[foo]  <span class="hljs-comment">// 2</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5F15;&#x7528;&#x5BF9;&#x8C61;<code>obj</code>&#x7684;<code>foo</code>&#x5C5E;&#x6027;&#x65F6;&#xFF0C;&#x5982;&#x679C;&#x4F7F;&#x7528;&#x70B9;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;<code>foo</code>&#x5C31;&#x662F;&#x5B57;&#x7B26;&#x4E32;&#xFF1B;&#x5982;&#x679C;&#x4F7F;&#x7528;&#x65B9;&#x62EC;&#x53F7;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x4F46;&#x662F;&#x4E0D;&#x4F7F;&#x7528;&#x5F15;&#x53F7;&#xFF0C;&#x90A3;&#x4E48;<code>foo</code>&#x5C31;&#x662F;&#x4E00;&#x4E2A;&#x53D8;&#x91CF;&#xFF0C;&#x6307;&#x5411;&#x5B57;&#x7B26;&#x4E32;<code>bar</code>&#x3002;</p>
<p>&#x65B9;&#x62EC;&#x53F7;&#x8FD0;&#x7B97;&#x7B26;&#x5185;&#x90E8;&#x8FD8;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x8868;&#x8FBE;&#x5F0F;&#x3002;</p>
<pre><code class="lang-javascript">obj[<span class="hljs-string">&apos;hello&apos;</span> + <span class="hljs-string">&apos; world&apos;</span>]
obj[<span class="hljs-number">3</span> + <span class="hljs-number">3</span>]
</code></pre>
<p>&#x6570;&#x5B57;&#x952E;&#x53EF;&#x4EE5;&#x4E0D;&#x52A0;&#x5F15;&#x53F7;&#xFF0C;&#x56E0;&#x4E3A;&#x4F1A;&#x81EA;&#x52A8;&#x8F6C;&#x6210;&#x5B57;&#x7B26;&#x4E32;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  <span class="hljs-number">0.7</span>: <span class="hljs-string">&apos;Hello World&apos;</span>
};

obj[<span class="hljs-string">&apos;0.7&apos;</span>] <span class="hljs-comment">// &quot;Hello World&quot;</span>
obj[<span class="hljs-number">0.7</span>] <span class="hljs-comment">// &quot;Hello World&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;<code>obj</code>&#x7684;&#x6570;&#x5B57;&#x952E;<code>0.7</code>&#xFF0C;&#x52A0;&#x4E0D;&#x52A0;&#x5F15;&#x53F7;&#x90FD;&#x53EF;&#x4EE5;&#xFF0C;&#x56E0;&#x4E3A;&#x4F1A;&#x88AB;&#x81EA;&#x52A8;&#x8F6C;&#x4E3A;&#x5B57;&#x7B26;&#x4E32;&#x3002;</p>
<p>&#x6CE8;&#x610F;&#xFF0C;&#x6570;&#x503C;&#x952E;&#x540D;&#x4E0D;&#x80FD;&#x4F7F;&#x7528;&#x70B9;&#x8FD0;&#x7B97;&#x7B26;&#xFF08;&#x56E0;&#x4E3A;&#x4F1A;&#x88AB;&#x5F53;&#x6210;&#x5C0F;&#x6570;&#x70B9;&#xFF09;&#xFF0C;&#x53EA;&#x80FD;&#x4F7F;&#x7528;&#x65B9;&#x62EC;&#x53F7;&#x8FD0;&#x7B97;&#x7B26;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  <span class="hljs-number">123</span>: <span class="hljs-string">&apos;hello world&apos;</span>
};

obj<span class="hljs-number">.123</span> <span class="hljs-comment">// &#x62A5;&#x9519;</span>
obj[<span class="hljs-number">123</span>] <span class="hljs-comment">// &quot;hello world&quot;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x7684;&#x7B2C;&#x4E00;&#x4E2A;&#x8868;&#x8FBE;&#x5F0F;&#xFF0C;&#x5BF9;&#x6570;&#x503C;&#x952E;&#x540D;<code>123</code>&#x4F7F;&#x7528;&#x70B9;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x7ED3;&#x679C;&#x62A5;&#x9519;&#x3002;&#x7B2C;&#x4E8C;&#x4E2A;&#x8868;&#x8FBE;&#x5F0F;&#x4F7F;&#x7528;&#x65B9;&#x62EC;&#x53F7;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x7ED3;&#x679C;&#x5C31;&#x662F;&#x6B63;&#x786E;&#x7684;&#x3002;</p>
<h3 id="&#x5C5E;&#x6027;&#x7684;&#x8D4B;&#x503C;">&#x5C5E;&#x6027;&#x7684;&#x8D4B;&#x503C;</h3>
<p>&#x70B9;&#x8FD0;&#x7B97;&#x7B26;&#x548C;&#x65B9;&#x62EC;&#x53F7;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x4E0D;&#x4EC5;&#x53EF;&#x4EE5;&#x7528;&#x6765;&#x8BFB;&#x53D6;&#x503C;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x7528;&#x6765;&#x8D4B;&#x503C;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {};

obj.foo = <span class="hljs-string">&apos;Hello&apos;</span>;
obj[<span class="hljs-string">&apos;bar&apos;</span>] = <span class="hljs-string">&apos;World&apos;</span>;
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5206;&#x522B;&#x4F7F;&#x7528;&#x70B9;&#x8FD0;&#x7B97;&#x7B26;&#x548C;&#x65B9;&#x62EC;&#x53F7;&#x8FD0;&#x7B97;&#x7B26;&#xFF0C;&#x5BF9;&#x5C5E;&#x6027;&#x8D4B;&#x503C;&#x3002;</p>
<p>JavaScript &#x5141;&#x8BB8;&#x5C5E;&#x6027;&#x7684;&#x201C;&#x540E;&#x7ED1;&#x5B9A;&#x201D;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;&#x4F60;&#x53EF;&#x4EE5;&#x5728;&#x4EFB;&#x610F;&#x65F6;&#x523B;&#x65B0;&#x589E;&#x5C5E;&#x6027;&#xFF0C;&#x6CA1;&#x5FC5;&#x8981;&#x5728;&#x5B9A;&#x4E49;&#x5BF9;&#x8C61;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5C31;&#x5B9A;&#x4E49;&#x597D;&#x5C5E;&#x6027;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = { p: <span class="hljs-number">1</span> };

<span class="hljs-comment">// &#x7B49;&#x4EF7;&#x4E8E;</span>

<span class="hljs-keyword">var</span> obj = {};
obj.p = <span class="hljs-number">1</span>;
</code></pre>
<h3 id="&#x5C5E;&#x6027;&#x7684;&#x67E5;&#x770B;">&#x5C5E;&#x6027;&#x7684;&#x67E5;&#x770B;</h3>
<p>&#x67E5;&#x770B;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x672C;&#x8EAB;&#x7684;&#x6240;&#x6709;&#x5C5E;&#x6027;&#xFF0C;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>Object.keys</code>&#x65B9;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {
  key1: <span class="hljs-number">1</span>,
  key2: <span class="hljs-number">2</span>
};

<span class="hljs-built_in">Object</span>.keys(obj);
<span class="hljs-comment">// [&apos;key1&apos;, &apos;key2&apos;]</span>
</code></pre>
<h3 id="&#x5C5E;&#x6027;&#x7684;&#x5220;&#x9664;&#xFF1A;delete-&#x547D;&#x4EE4;">&#x5C5E;&#x6027;&#x7684;&#x5220;&#x9664;&#xFF1A;delete &#x547D;&#x4EE4;</h3>
<p><code>delete</code>&#x547D;&#x4EE4;&#x7528;&#x4E8E;&#x5220;&#x9664;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x5220;&#x9664;&#x6210;&#x529F;&#x540E;&#x8FD4;&#x56DE;<code>true</code>&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = { p: <span class="hljs-number">1</span> };
<span class="hljs-built_in">Object</span>.keys(obj) <span class="hljs-comment">// [&quot;p&quot;]</span>

<span class="hljs-keyword">delete</span> obj.p <span class="hljs-comment">// true</span>
obj.p <span class="hljs-comment">// undefined</span>
<span class="hljs-built_in">Object</span>.keys(obj) <span class="hljs-comment">// []</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>delete</code>&#x547D;&#x4EE4;&#x5220;&#x9664;&#x5BF9;&#x8C61;<code>obj</code>&#x7684;<code>p</code>&#x5C5E;&#x6027;&#x3002;&#x5220;&#x9664;&#x540E;&#xFF0C;&#x518D;&#x8BFB;&#x53D6;<code>p</code>&#x5C5E;&#x6027;&#x5C31;&#x4F1A;&#x8FD4;&#x56DE;<code>undefined</code>&#xFF0C;&#x800C;&#x4E14;<code>Object.keys</code>&#x65B9;&#x6CD5;&#x7684;&#x8FD4;&#x56DE;&#x503C;&#x4E5F;&#x4E0D;&#x518D;&#x5305;&#x62EC;&#x8BE5;&#x5C5E;&#x6027;&#x3002;</p>
<p>&#x6CE8;&#x610F;&#xFF0C;&#x5220;&#x9664;&#x4E00;&#x4E2A;&#x4E0D;&#x5B58;&#x5728;&#x7684;&#x5C5E;&#x6027;&#xFF0C;<code>delete</code>&#x4E0D;&#x62A5;&#x9519;&#xFF0C;&#x800C;&#x4E14;&#x8FD4;&#x56DE;<code>true</code>&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {};
<span class="hljs-keyword">delete</span> obj.p <span class="hljs-comment">// true</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;<code>obj</code>&#x5E76;&#x6CA1;&#x6709;<code>p</code>&#x5C5E;&#x6027;&#xFF0C;&#x4F46;&#x662F;<code>delete</code>&#x547D;&#x4EE4;&#x7167;&#x6837;&#x8FD4;&#x56DE;<code>true</code>&#x3002;&#x56E0;&#x6B64;&#xFF0C;&#x4E0D;&#x80FD;&#x6839;&#x636E;<code>delete</code>&#x547D;&#x4EE4;&#x7684;&#x7ED3;&#x679C;&#xFF0C;&#x8BA4;&#x5B9A;&#x67D0;&#x4E2A;&#x5C5E;&#x6027;&#x662F;&#x5B58;&#x5728;&#x7684;&#x3002;</p>
<p>&#x53EA;&#x6709;&#x4E00;&#x79CD;&#x60C5;&#x51B5;&#xFF0C;<code>delete</code>&#x547D;&#x4EE4;&#x4F1A;&#x8FD4;&#x56DE;<code>false</code>&#xFF0C;&#x90A3;&#x5C31;&#x662F;&#x8BE5;&#x5C5E;&#x6027;&#x5B58;&#x5728;&#xFF0C;&#x4E14;&#x4E0D;&#x5F97;&#x5220;&#x9664;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = <span class="hljs-built_in">Object</span>.defineProperty({}, <span class="hljs-string">&apos;p&apos;</span>, {
  value: <span class="hljs-number">123</span>,
  configurable: <span class="hljs-literal">false</span>
});

obj.p <span class="hljs-comment">// 123</span>
<span class="hljs-keyword">delete</span> obj.p <span class="hljs-comment">// false</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E4B;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;<code>obj</code>&#x7684;<code>p</code>&#x5C5E;&#x6027;&#x662F;&#x4E0D;&#x80FD;&#x5220;&#x9664;&#x7684;&#xFF0C;&#x6240;&#x4EE5;<code>delete</code>&#x547D;&#x4EE4;&#x8FD4;&#x56DE;<code>false</code>&#xFF08;&#x5173;&#x4E8E;<code>Object.defineProperty</code>&#x65B9;&#x6CD5;&#x7684;&#x4ECB;&#x7ECD;&#xFF0C;&#x8BF7;&#x770B;&#x300A;&#x6807;&#x51C6;&#x5E93;&#x300B;&#x7684; Object &#x5BF9;&#x8C61;&#x4E00;&#x7AE0;&#xFF09;&#x3002;</p>
<p>&#x53E6;&#x5916;&#xFF0C;&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C;<code>delete</code>&#x547D;&#x4EE4;&#x53EA;&#x80FD;&#x5220;&#x9664;&#x5BF9;&#x8C61;&#x672C;&#x8EAB;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x65E0;&#x6CD5;&#x5220;&#x9664;&#x7EE7;&#x627F;&#x7684;&#x5C5E;&#x6027;&#xFF08;&#x5173;&#x4E8E;&#x7EE7;&#x627F;&#x53C2;&#x89C1;&#x300A;&#x9762;&#x5411;&#x5BF9;&#x8C61;&#x7F16;&#x7A0B;&#x300B;&#x7AE0;&#x8282;&#xFF09;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {};
<span class="hljs-keyword">delete</span> obj.toString <span class="hljs-comment">// true</span>
obj.toString <span class="hljs-comment">// function toString() { [native code] }</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>toString</code>&#x662F;&#x5BF9;&#x8C61;<code>obj</code>&#x7EE7;&#x627F;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x867D;&#x7136;<code>delete</code>&#x547D;&#x4EE4;&#x8FD4;&#x56DE;<code>true</code>&#xFF0C;&#x4F46;&#x8BE5;&#x5C5E;&#x6027;&#x5E76;&#x6CA1;&#x6709;&#x88AB;&#x5220;&#x9664;&#xFF0C;&#x4F9D;&#x7136;&#x5B58;&#x5728;&#x3002;&#x8FD9;&#x4E2A;&#x4F8B;&#x5B50;&#x8FD8;&#x8BF4;&#x660E;&#xFF0C;&#x5373;&#x4F7F;<code>delete</code>&#x8FD4;&#x56DE;<code>true</code>&#xFF0C;&#x8BE5;&#x5C5E;&#x6027;&#x4F9D;&#x7136;&#x53EF;&#x80FD;&#x8BFB;&#x53D6;&#x5230;&#x503C;&#x3002;</p>
<h3 id="&#x5C5E;&#x6027;&#x662F;&#x5426;&#x5B58;&#x5728;&#xFF1A;in-&#x8FD0;&#x7B97;&#x7B26;">&#x5C5E;&#x6027;&#x662F;&#x5426;&#x5B58;&#x5728;&#xFF1A;in &#x8FD0;&#x7B97;&#x7B26;</h3>
<p><code>in</code>&#x8FD0;&#x7B97;&#x7B26;&#x7528;&#x4E8E;&#x68C0;&#x67E5;&#x5BF9;&#x8C61;&#x662F;&#x5426;&#x5305;&#x542B;&#x67D0;&#x4E2A;&#x5C5E;&#x6027;&#xFF08;&#x6CE8;&#x610F;&#xFF0C;&#x68C0;&#x67E5;&#x7684;&#x662F;&#x952E;&#x540D;&#xFF0C;&#x4E0D;&#x662F;&#x952E;&#x503C;&#xFF09;&#xFF0C;&#x5982;&#x679C;&#x5305;&#x542B;&#x5C31;&#x8FD4;&#x56DE;<code>true</code>&#xFF0C;&#x5426;&#x5219;&#x8FD4;&#x56DE;<code>false</code>&#x3002;&#x5B83;&#x7684;&#x5DE6;&#x8FB9;&#x662F;&#x4E00;&#x4E2A;&#x5B57;&#x7B26;&#x4E32;&#xFF0C;&#x8868;&#x793A;&#x5C5E;&#x6027;&#x540D;&#xFF0C;&#x53F3;&#x8FB9;&#x662F;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = { p: <span class="hljs-number">1</span> };
<span class="hljs-string">&apos;p&apos;</span> <span class="hljs-keyword">in</span> obj <span class="hljs-comment">// true</span>
<span class="hljs-string">&apos;toString&apos;</span> <span class="hljs-keyword">in</span> obj <span class="hljs-comment">// true</span>
</code></pre>
<p><code>in</code>&#x8FD0;&#x7B97;&#x7B26;&#x7684;&#x4E00;&#x4E2A;&#x95EE;&#x9898;&#x662F;&#xFF0C;&#x5B83;&#x4E0D;&#x80FD;&#x8BC6;&#x522B;&#x54EA;&#x4E9B;&#x5C5E;&#x6027;&#x662F;&#x5BF9;&#x8C61;&#x81EA;&#x8EAB;&#x7684;&#xFF0C;&#x54EA;&#x4E9B;&#x5C5E;&#x6027;&#x662F;&#x7EE7;&#x627F;&#x7684;&#x3002;&#x5C31;&#x50CF;&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;<code>obj</code>&#x672C;&#x8EAB;&#x5E76;&#x6CA1;&#x6709;<code>toString</code>&#x5C5E;&#x6027;&#xFF0C;&#x4F46;&#x662F;<code>in</code>&#x8FD0;&#x7B97;&#x7B26;&#x4F1A;&#x8FD4;&#x56DE;<code>true</code>&#xFF0C;&#x56E0;&#x4E3A;&#x8FD9;&#x4E2A;&#x5C5E;&#x6027;&#x662F;&#x7EE7;&#x627F;&#x7684;&#x3002;</p>
<p>&#x8FD9;&#x65F6;&#xFF0C;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x5BF9;&#x8C61;&#x7684;<code>hasOwnProperty</code>&#x65B9;&#x6CD5;&#x5224;&#x65AD;&#x4E00;&#x4E0B;&#xFF0C;&#x662F;&#x5426;&#x4E3A;&#x5BF9;&#x8C61;&#x81EA;&#x8EAB;&#x7684;&#x5C5E;&#x6027;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {};
<span class="hljs-keyword">if</span> (<span class="hljs-string">&apos;toString&apos;</span> <span class="hljs-keyword">in</span> obj) {
  <span class="hljs-built_in">console</span>.log(obj.hasOwnProperty(<span class="hljs-string">&apos;toString&apos;</span>)) <span class="hljs-comment">// false</span>
}
</code></pre>
<h3 id="&#x5C5E;&#x6027;&#x7684;&#x904D;&#x5386;&#xFF1A;forin-&#x5FAA;&#x73AF;">&#x5C5E;&#x6027;&#x7684;&#x904D;&#x5386;&#xFF1A;for...in &#x5FAA;&#x73AF;</h3>
<p><code>for...in</code>&#x5FAA;&#x73AF;&#x7528;&#x6765;&#x904D;&#x5386;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x7684;&#x5168;&#x90E8;&#x5C5E;&#x6027;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {a: <span class="hljs-number">1</span>, b: <span class="hljs-number">2</span>, c: <span class="hljs-number">3</span>};

<span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i <span class="hljs-keyword">in</span> obj) {
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x952E;&#x540D;&#xFF1A;&apos;</span>, i);
  <span class="hljs-built_in">console</span>.log(<span class="hljs-string">&apos;&#x952E;&#x503C;&#xFF1A;&apos;</span>, obj[i]);
}
<span class="hljs-comment">// &#x952E;&#x540D;&#xFF1A; a</span>
<span class="hljs-comment">// &#x952E;&#x503C;&#xFF1A; 1</span>
<span class="hljs-comment">// &#x952E;&#x540D;&#xFF1A; b</span>
<span class="hljs-comment">// &#x952E;&#x503C;&#xFF1A; 2</span>
<span class="hljs-comment">// &#x952E;&#x540D;&#xFF1A; c</span>
<span class="hljs-comment">// &#x952E;&#x503C;&#xFF1A; 3</span>
</code></pre>
<p><code>for...in</code>&#x5FAA;&#x73AF;&#x6709;&#x4E24;&#x4E2A;&#x4F7F;&#x7528;&#x6CE8;&#x610F;&#x70B9;&#x3002;</p>
<ul>
<li>&#x5B83;&#x904D;&#x5386;&#x7684;&#x662F;&#x5BF9;&#x8C61;&#x6240;&#x6709;&#x53EF;&#x904D;&#x5386;&#xFF08;enumerable&#xFF09;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x4F1A;&#x8DF3;&#x8FC7;&#x4E0D;&#x53EF;&#x904D;&#x5386;&#x7684;&#x5C5E;&#x6027;&#x3002;</li>
<li>&#x5B83;&#x4E0D;&#x4EC5;&#x904D;&#x5386;&#x5BF9;&#x8C61;&#x81EA;&#x8EAB;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x8FD8;&#x904D;&#x5386;&#x7EE7;&#x627F;&#x7684;&#x5C5E;&#x6027;&#x3002;</li>
</ul>
<p>&#x4E3E;&#x4F8B;&#x6765;&#x8BF4;&#xFF0C;&#x5BF9;&#x8C61;&#x90FD;&#x7EE7;&#x627F;&#x4E86;<code>toString</code>&#x5C5E;&#x6027;&#xFF0C;&#x4F46;&#x662F;<code>for...in</code>&#x5FAA;&#x73AF;&#x4E0D;&#x4F1A;&#x904D;&#x5386;&#x5230;&#x8FD9;&#x4E2A;&#x5C5E;&#x6027;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {};

<span class="hljs-comment">// toString &#x5C5E;&#x6027;&#x662F;&#x5B58;&#x5728;&#x7684;</span>
obj.toString <span class="hljs-comment">// toString() { [native code] }</span>

<span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> p <span class="hljs-keyword">in</span> obj) {
  <span class="hljs-built_in">console</span>.log(p);
} <span class="hljs-comment">// &#x6CA1;&#x6709;&#x4EFB;&#x4F55;&#x8F93;&#x51FA;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;<code>obj</code>&#x7EE7;&#x627F;&#x4E86;<code>toString</code>&#x5C5E;&#x6027;&#xFF0C;&#x8BE5;&#x5C5E;&#x6027;&#x4E0D;&#x4F1A;&#x88AB;<code>for...in</code>&#x5FAA;&#x73AF;&#x904D;&#x5386;&#x5230;&#xFF0C;&#x56E0;&#x4E3A;&#x5B83;&#x9ED8;&#x8BA4;&#x662F;&#x201C;&#x4E0D;&#x53EF;&#x904D;&#x5386;&#x201D;&#x7684;&#x3002;&#x5173;&#x4E8E;&#x5BF9;&#x8C61;&#x5C5E;&#x6027;&#x7684;&#x53EF;&#x904D;&#x5386;&#x6027;&#xFF0C;&#x53C2;&#x89C1;&#x300A;&#x6807;&#x51C6;&#x5E93;&#x300B;&#x7AE0;&#x8282;&#x4E2D; Object &#x4E00;&#x7AE0;&#x7684;&#x4ECB;&#x7ECD;&#x3002;</p>
<p>&#x5982;&#x679C;&#x7EE7;&#x627F;&#x7684;&#x5C5E;&#x6027;&#x662F;&#x53EF;&#x904D;&#x5386;&#x7684;&#xFF0C;&#x90A3;&#x4E48;&#x5C31;&#x4F1A;&#x88AB;<code>for...in</code>&#x5FAA;&#x73AF;&#x904D;&#x5386;&#x5230;&#x3002;&#x4F46;&#x662F;&#xFF0C;&#x4E00;&#x822C;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x90FD;&#x662F;&#x53EA;&#x60F3;&#x904D;&#x5386;&#x5BF9;&#x8C61;&#x81EA;&#x8EAB;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x6240;&#x4EE5;&#x4F7F;&#x7528;<code>for...in</code>&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x5E94;&#x8BE5;&#x7ED3;&#x5408;&#x4F7F;&#x7528;<code>hasOwnProperty</code>&#x65B9;&#x6CD5;&#xFF0C;&#x5728;&#x5FAA;&#x73AF;&#x5185;&#x90E8;&#x5224;&#x65AD;&#x4E00;&#x4E0B;&#xFF0C;&#x67D0;&#x4E2A;&#x5C5E;&#x6027;&#x662F;&#x5426;&#x4E3A;&#x5BF9;&#x8C61;&#x81EA;&#x8EAB;&#x7684;&#x5C5E;&#x6027;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> person = { name: <span class="hljs-string">&apos;&#x8001;&#x5F20;&apos;</span> };

<span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> key <span class="hljs-keyword">in</span> person) {
  <span class="hljs-keyword">if</span> (person.hasOwnProperty(key)) {
    <span class="hljs-built_in">console</span>.log(key);
  }
}
<span class="hljs-comment">// name</span>
</code></pre>
<h2 id="with-&#x8BED;&#x53E5;">with &#x8BED;&#x53E5;</h2>
<p><code>with</code>&#x8BED;&#x53E5;&#x7684;&#x683C;&#x5F0F;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">with</span> (&#x5BF9;&#x8C61;) {
  &#x8BED;&#x53E5;;
}
</code></pre>
<p>&#x5B83;&#x7684;&#x4F5C;&#x7528;&#x662F;&#x64CD;&#x4F5C;&#x540C;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x7684;&#x591A;&#x4E2A;&#x5C5E;&#x6027;&#x65F6;&#xFF0C;&#x63D0;&#x4F9B;&#x4E00;&#x4E9B;&#x4E66;&#x5199;&#x7684;&#x65B9;&#x4FBF;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x4F8B;&#x4E00;</span>
<span class="hljs-keyword">var</span> obj = {
  p1: <span class="hljs-number">1</span>,
  p2: <span class="hljs-number">2</span>,
};
<span class="hljs-keyword">with</span> (obj) {
  p1 = <span class="hljs-number">4</span>;
  p2 = <span class="hljs-number">5</span>;
}
<span class="hljs-comment">// &#x7B49;&#x540C;&#x4E8E;</span>
obj.p1 = <span class="hljs-number">4</span>;
obj.p2 = <span class="hljs-number">5</span>;

<span class="hljs-comment">// &#x4F8B;&#x4E8C;</span>
<span class="hljs-keyword">with</span> (<span class="hljs-built_in">document</span>.links[<span class="hljs-number">0</span>]){
  <span class="hljs-built_in">console</span>.log(href);
  <span class="hljs-built_in">console</span>.log(title);
  <span class="hljs-built_in">console</span>.log(style);
}
<span class="hljs-comment">// &#x7B49;&#x540C;&#x4E8E;</span>
<span class="hljs-built_in">console</span>.log(<span class="hljs-built_in">document</span>.links[<span class="hljs-number">0</span>].href);
<span class="hljs-built_in">console</span>.log(<span class="hljs-built_in">document</span>.links[<span class="hljs-number">0</span>].title);
<span class="hljs-built_in">console</span>.log(<span class="hljs-built_in">document</span>.links[<span class="hljs-number">0</span>].style);
</code></pre>
<p>&#x6CE8;&#x610F;&#xFF0C;&#x5982;&#x679C;<code>with</code>&#x533A;&#x5757;&#x5185;&#x90E8;&#x6709;&#x53D8;&#x91CF;&#x7684;&#x8D4B;&#x503C;&#x64CD;&#x4F5C;&#xFF0C;&#x5FC5;&#x987B;&#x662F;&#x5F53;&#x524D;&#x5BF9;&#x8C61;&#x5DF2;&#x7ECF;&#x5B58;&#x5728;&#x7684;&#x5C5E;&#x6027;&#xFF0C;&#x5426;&#x5219;&#x4F1A;&#x521B;&#x9020;&#x4E00;&#x4E2A;&#x5F53;&#x524D;&#x4F5C;&#x7528;&#x57DF;&#x7684;&#x5168;&#x5C40;&#x53D8;&#x91CF;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> obj = {};
<span class="hljs-keyword">with</span> (obj) {
  p1 = <span class="hljs-number">4</span>;
  p2 = <span class="hljs-number">5</span>;
}

obj.p1 <span class="hljs-comment">// undefined</span>
p1 <span class="hljs-comment">// 4</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5BF9;&#x8C61;<code>obj</code>&#x5E76;&#x6CA1;&#x6709;<code>p1</code>&#x5C5E;&#x6027;&#xFF0C;&#x5BF9;<code>p1</code>&#x8D4B;&#x503C;&#x7B49;&#x4E8E;&#x521B;&#x9020;&#x4E86;&#x4E00;&#x4E2A;&#x5168;&#x5C40;&#x53D8;&#x91CF;<code>p1</code>&#x3002;&#x6B63;&#x786E;&#x7684;&#x5199;&#x6CD5;&#x5E94;&#x8BE5;&#x662F;&#xFF0C;&#x5148;&#x5B9A;&#x4E49;&#x5BF9;&#x8C61;<code>obj</code>&#x7684;&#x5C5E;&#x6027;<code>p1</code>&#xFF0C;&#x7136;&#x540E;&#x5728;<code>with</code>&#x533A;&#x5757;&#x5185;&#x64CD;&#x4F5C;&#x5B83;&#x3002;</p>
<p>&#x8FD9;&#x662F;&#x56E0;&#x4E3A;<code>with</code>&#x533A;&#x5757;&#x6CA1;&#x6709;&#x6539;&#x53D8;&#x4F5C;&#x7528;&#x57DF;&#xFF0C;&#x5B83;&#x7684;&#x5185;&#x90E8;&#x4F9D;&#x7136;&#x662F;&#x5F53;&#x524D;&#x4F5C;&#x7528;&#x57DF;&#x3002;&#x8FD9;&#x9020;&#x6210;&#x4E86;<code>with</code>&#x8BED;&#x53E5;&#x7684;&#x4E00;&#x4E2A;&#x5F88;&#x5927;&#x7684;&#x5F0A;&#x75C5;&#xFF0C;&#x5C31;&#x662F;&#x7ED1;&#x5B9A;&#x5BF9;&#x8C61;&#x4E0D;&#x660E;&#x786E;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">with</span> (obj) {
  <span class="hljs-built_in">console</span>.log(x);
}
</code></pre>
<p>&#x5355;&#x7EAF;&#x4ECE;&#x4E0A;&#x9762;&#x7684;&#x4EE3;&#x7801;&#x5757;&#xFF0C;&#x6839;&#x672C;&#x65E0;&#x6CD5;&#x5224;&#x65AD;<code>x</code>&#x5230;&#x5E95;&#x662F;&#x5168;&#x5C40;&#x53D8;&#x91CF;&#xFF0C;&#x8FD8;&#x662F;&#x5BF9;&#x8C61;<code>obj</code>&#x7684;&#x4E00;&#x4E2A;&#x5C5E;&#x6027;&#x3002;&#x8FD9;&#x975E;&#x5E38;&#x4E0D;&#x5229;&#x4E8E;&#x4EE3;&#x7801;&#x7684;&#x9664;&#x9519;&#x548C;&#x6A21;&#x5757;&#x5316;&#xFF0C;&#x7F16;&#x8BD1;&#x5668;&#x4E5F;&#x65E0;&#x6CD5;&#x5BF9;&#x8FD9;&#x6BB5;&#x4EE3;&#x7801;&#x8FDB;&#x884C;&#x4F18;&#x5316;&#xFF0C;&#x53EA;&#x80FD;&#x7559;&#x5230;&#x8FD0;&#x884C;&#x65F6;&#x5224;&#x65AD;&#xFF0C;&#x8FD9;&#x5C31;&#x62D6;&#x6162;&#x4E86;&#x8FD0;&#x884C;&#x901F;&#x5EA6;&#x3002;&#x56E0;&#x6B64;&#xFF0C;&#x5EFA;&#x8BAE;&#x4E0D;&#x8981;&#x4F7F;&#x7528;<code>with</code>&#x8BED;&#x53E5;&#xFF0C;&#x53EF;&#x4EE5;&#x8003;&#x8651;&#x7528;&#x4E00;&#x4E2A;&#x4E34;&#x65F6;&#x53D8;&#x91CF;&#x4EE3;&#x66FF;<code>with</code>&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">with</span>(obj1.obj2.obj3) {
  <span class="hljs-built_in">console</span>.log(p1 + p2);
}

<span class="hljs-comment">// &#x53EF;&#x4EE5;&#x5199;&#x6210;</span>
<span class="hljs-keyword">var</span> temp = obj1.obj2.obj3;
<span class="hljs-built_in">console</span>.log(temp.p1 + temp.p2);
</code></pre>
<h2 id="&#x53C2;&#x8003;&#x94FE;&#x63A5;">&#x53C2;&#x8003;&#x94FE;&#x63A5;</h2>
<ul>
<li>Dr. Axel Rauschmayer&#xFF0C;<a href="http://www.2ality.com/2012/10/javascript-properties.html" target="_blank" rel="nofollow">Object properties in JavaScript</a></li>
<li>Lakshan Perera, <a href="http://www.laktek.com/2012/12/29/revisiting-javascript-objects/" target="_blank" rel="nofollow">Revisiting JavaScript Objects</a></li>
<li>Angus Croll, <a href="http://javascriptweblog.wordpress.com/2010/09/27/the-secret-life-of-javascript-primitives/" target="_blank" rel="nofollow">The Secret Life of JavaScript Primitives</a>i</li>
<li>Dr. Axel Rauschmayer, <a href="http://www.2ality.com/2011/06/with-statement.html" target="_blank" rel="nofollow">JavaScript&#x2019;s with statement and why it&#x2019;s deprecated</a></li>
</ul>




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